Merge commit '46e4ed6b' into feature/multi-level-container-registry-images

* commit '46e4ed6b': (28 commits)
  Award emoji button smiley animation
  Introduced empty/error UX states to environments monitoring.
  Github import rake task
  Remove individual modal width styles
  Fix RuboCop for removing index
  Link to docs site for file in doc/
  Disable invalid service templates (again)
  Show CI status as Favicon on Pipelines, Job and MR pages
  STL file viewer
  Wait for the PDF to be loaded before doing anything
  remove unnecessary lease as cron job
  Search for opened MRs - include reopened  MRs
  ProjectsFinder should handle more options
  Clearly show who triggered the pipeline in email
  Make it possible to preview pipeline success/failed emails
  Add remove_concurrent_index to database helper
  Add more tests for subgroups feature
  Large features by the 1st, small ones by the 3rd
  Ask people to create EE MRs on the 7th
  fix project authorizations migration issue
  ...

Resolve "Make modal sizes consistent and mobile friendly"

Closes #29470

See merge request !10088

Fixed user profile tabs causing the page to scroll

Closes #30338

See merge request !10405

Disable invalid service templates (again)

Closes #30024

See merge request !10339

Ask people to create EE MRs on the 7th

See merge request !10371

Add more tests for subgroups feature

See merge request !10486

Prevent Trigger action buttons from wrapping

Closes #29807

See merge request !10186

Award emoji button smiley animation

See merge request !10130

Introduced empty/error UX states to environments monitoring.

Closes #29212

See merge request !10271

Github import rake task

See merge request !10308

Search for opened MRs - include reopened  MRs

Closes #30291

See merge request !10407

Wait for the PDF to be loaded before doing anything

Closes #30531

See merge request !10493

Fix html structure to prevent tooltip from not hidding

Closes #30493

See merge request !10474

Periodically mark projects that are stuck in importing as failed

Closes #17709

See merge request !10207

Add remove_concurrent_index to database helper

Closes #30376

See merge request !10441

Show CI status as Favicon on Pipelines, Job and MR pages

Closes #12818

See merge request !10144

* master: (94 commits)
  Merge branch 'open-redirect-fix-continue-to' into 'security'
  Merge branch 'open-redirect-host-fix' into 'security'
  Merge branch 'path-disclosure-proj-import-export' into 'security'
  Merge branch '29364-private-projects-mr-fix'
  Merge branch '30125-markdown-security'
  Issue title realtime
  Update CHANGELOG.md for 8.16.9
  Update CHANGELOG.md for 8.17.5
  Update CHANGELOG.md for 9.0.4
  Add "search" optional param and docs for V4
  Use PDFLab to render PDFs in GitLab
  Separate Scala from Java in CI examples
  Fix broken link
  Reorganize CI examples, add more links
  Refactor CI index page
  Remove deprecated field from workhorse response
  Use gitlab-workhorse 1.4.3
  Document how ETag caching middleware handles query parameters
  Make group skip validation in the frontend
  Use NamespaceValidator::WILDCARD_ROUTES in ETag caching middleware
  ...

ProjectsFinder should handle more options

Closes #28810

See merge request !9682

Enable creation of deploy keys with write access via the API

Closes #30021

See merge request !10488

STL file viewer

See merge request !10368

Closes #30531

Clearly show who triggered the pipeline in pipeline successful/failed email

Closes #28755

See merge request !10283

Extended ProjectFinder in order to handle the following options:
 - current_user - which user use
 - project_ids_relation: int[] - project ids to use
 - params:
   -  trending: boolean
   -  non_public: boolean
   -  starred: boolean
   -  sort: string
   -  visibility_level: int
   -  tags: string[]
   -  personal: boolean
   -  search: string
   -  non_archived: boolean

GroupProjectsFinder now inherits from ProjectsFinder.
Changed the code in order to use the new available options.

Show who triggered the pipeline. And also show the commit committer if
it's different from the author.

Visit `/rails/mailers/notify` on your local running GitLab instance to
show a preview pipeline success emails.

Fix for open redirect vuln involving continue[to] params

See merge request !2083